Could one use something like this from the surface to detect steel submerged under 20-40 feet of water?
I think, not from the surface, but have a look here [1], where the author referenced from the IIEE article has build a submergible sensor and detected (a know) boat.
[1] https://alexmumm.de/pgProtonMagMarine_en.htm
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I think, not from the surface, but have a look here [1], where the author referenced from the IIEE article has build a submergible sensor and detected (a know) boat.
[1] https://alexmumm.de/pgProtonMagMarine_en.htm